Limiting activity coefficients of 1-Chlorobutane (cas 109-69-3) in water and in aqueous solutions of substances involved in synthesis of ionic liquids
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Add time:08/21/2019 Source:sciencedirect.com
Limiting activity coefficients (γ1∞) were measured for 1-Chlorobutane (cas 109-69-3) in water and in aqueous solutions of the additives 1-methylimidazole (MeIm), ionic liquid 1-butyl-3-methylimidazolium chloride (BMImCl), and sodium chloride (NaCl) at temperatures from 273.35 to 308.15 K and additive concentrations from 0 to 0.6 mol kg−1 employing the methods of inert gas stripping and exponential saturator. The data measured in this work enabled us to establish recommended temperature dependence for γ1∞ of 1-chlorobutane in water. To this end, the present data were supplemented with (i) compiled and critically evaluated γ1∞ data from the literature and (ii) an estimated value of infinite dilution partial molar heat capacity and subsequently fitted to a suitable model equation. The recommended values of γ1∞ and from them inferred values of solubility, Henry’s law constant, and air–water partition coefficients are reported at several temperatures. The effect of the additives corresponds to either salting-in (MeIm, BMImCl) or salting-out (NaCl). The temperature and additive concentration dependence of γ1∞ were fitted simultaneously using a five-parameter model equation. The enthalpy and entropy of the transfer of 1-chlorobutane from water to aqueous solutions of the additives were further derived, disclosing the thermodynamic origin of the observed salting-in/salting-out processes.
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